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WM8731 bảng dữ liệu(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8731 bảng dữ liệu(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 56 page  WM8731 Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates Advanced Information, Rev 2.0, February 2001 WOLFSON MICROELECTRONICS LTD Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176 Email: sales@wolfson.co.uk www.wolfsonmicro.com Advanced Information data sheets contain preliminary data on new products in the preproduction phase of development. Supplementary data will be published at a later date. 2001 Wolfson Microelectronics Ltd . DESCRIPTION The WM8731 is a low power stereo CODEC with an integrated headphone driver. It offers the user the unique ability to independently program the ADC and DAC sample rates from a single clock source. The WM8731 is designed specifically for portable MP3 audio and speech players and recorders. The WM8731 is also ideal for MD, CD-RW machines and DAT recorders. Stereo line and mono microphone level audio inputs are provided, along with a mute function, programmable line level volume control and a bias voltage output suitable for an electret type microphone. Stereo 24-bit multi-bit sigma delta ADCs and DACs are used with oversampling digital interpolation and decimation filters. Digital audio input word lengths from 16-32 bits and sampling rates from 8kHz to 96kHz are supported. Stereo audio outputs are buffered for driving headphones from a programmable volume control, line level outputs are also provided along with anti-thump mute and power up/down circuitry. The device is controlled via a 2 or 3 wire serial interface. The interface provides access to all features including volume controls, mutes, de-emphasis and extensive power management facilities. The device is available in a small 28- pin SSOP package. FEATURES • Audio Performance − 97dB SNR (‘A’ weighted @ 48kHz) ADC − 100dB SNR (‘A’ weighted @ 48kHz) DAC − 1.42 – 3.6V Digital Supply Operation − 2.7 – 3.6V Analogue Supply Operation • ADC and DAC Sampling Frequency: 8kHz – 96kHz • Selectable ADC High Pass Filter • 2 or 3-Wire MPU Serial Control Interface • Programmable Audio Data Interface Modes − I2S, Left, Right Justified or DSP − 16/20/24/32 bit Word Lengths − Master or Slave Clocking Mode • Stereo Audio Inputs and Outputs • Microphone Input and Electret Bias with Side Tone Mixer • Input and Output Volume and Mute Controls • Highly Efficient Headphone Driver • Playback Mode Power Consumption < 18mW • Analogue Pass Through Power Consumption < 9mW • 28-Pin SSOP Package APPLICATIONS • Portable MP3 Players and Recorders • CD and Minidisc Recorders BLOCK DIAGRAM MUX MUX VOL VOL ADC ADC DIGITAL FILTERS DIGTAL AUDIO INTERFACE CONTROL INTERFACE DAC DAC VOL/ MUTE VOL/ MUTE H/P DRIVER H/P DRIVER Σ Σ RHPOUT LHPOUT ROUT LOUT RLINEIN LLINEIN VMID AVDD AGND 0dB/ 20dB MICIN +12 to -34.5dB, 1.5dB Steps +6 to -73dB 1 dB Steps HPVDD HPGND +6 to -73dB 1 dB Steps +12 to -34.5dB, 1.5dB Steps OSC MICBIAS MUTE Bypass Bypass Side Tone Side Tone CLKIN DIVIDER (Div x1, x2) CLKOUT DIVIDER (Div x1, x2) ATTEN/ MUTE MUTE MUTE ATTEN/ MUTE MUTE MUTE MUTE MUTE MUTE WM8731 |
Số phần tương tự - WM8731 |
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Mô tả tương tự - WM8731 |
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